Multi Tourmaline 4mm Banded Blue/Green Microfaceted Round - 15-16 Inch 4-22mm where it was mined since

where it was mined since around 300 BCE

Rhyolite or Tuff

this color forms black

also known as Nacre

Multi Tourmaline 4mm Banded Blue/Green Microfaceted Round - 15-16 Inch 4-22mm where it was mined sinceTourmaline is classified as a semiprecious stone and occurs in a vast array of colors, everything from colorless to black, from pastel to bright to dark. It can even exhibit various colors within the same specimen. Its name derives from the Sinhalese word turamali, which translates to stone of many colors. Due to this variety of colors, Tourmaline has often been confused with other stones. Many stones in the Russian crown jewels from the 17th century